Modbury is a large village, ecclesiastical parish, civil parish and former manor in the South Hams district of the county of Devon in England. Today due to its large size it is generally referred to as a "town" although the parish council has not elected to give itself the status of a town as it could do under s.245(6) of the Local Government Act 1972, so it does not have a town council and cannot have a town mayor. It is also known informally as a "market town", as from at least 1199 the lord of the manor has held the right to hold a regular market. The village is situated on the A379 road, which links it to Plymouth and Kingsbridge. The current parish population is approximately 1,500.

The name Modbury is a corruption of the Anglo-Saxon name, Moot burgh from 'Moot' meaning either 'Mud' or 'meeting' and 'bury' meaning 'fortified enclosure'.

Modbury is recorded in the Domesday Book of 1086. It has had permission to hold a weekly fair since before 1199. The population of the town was greatly reduced as a consequence of the Black Death in the 14th century.

Modbury was the site of two battles in the English Civil War. The first battle was a surprise attack by a mounted Parliamentarian force led by Sir William Ruthven that moved under cover of darkness from Plymouth via Ivybridge on 7 December 1642. In the early morning charge they routed a mostly untrained Royalist force that had gathered in the town, where Sir Ralph Hopton, the King's senior commander in the West Country, was holding council at the manor house of Champernowne Court. The house was badly damaged by fire, Hopton escaped but many notable Devon Royalists were captured.

The second Battle of Modbury occurred on 22 February 1643 when the Royalists forces, expecting an attack by Parliamentarian forces assembled at nearby Kingsbridge, had fortified the town. Outnumbered approximately four to one, and running short of ammunition, the royalists retreated. This victory was largely instrumental in the lifting of the Siege of Plymouth, and the driving of the encircling Royalist forces into Cornwall.

By 1801, the population of Modbury had risen to 1,813, with almost half engaged in the wool trade. The impact of the mechanisation of the wool industry had a dramatic effect on the economic prosperity and population of the town from the mid-1820s. Many workers left the town and headed to large cities in search of employment, while others left the country altogether, emigrating to America.

The railway line bypassed Modbury, contributing still further to this decline. Modbury remained an important market town until as late as 1944 when the cattle market ceased.

The manor of Modbury was held from the time of Domesday Book by the Vautort family, and passed successively to the families of Okeston and Champernowne. In Domesday Book it's listed as two separate parts; the principal one as Motbilie, one of the holdings of Robert, Count of Mortain, half-brother of William the Conqueror. Robert's tenant was one of his important Anglo-Norman followers, Reginald I de Vautort. Later,^[when?] Sir Roger de Vautort granted the manor, together with Bridford, to Sir Alexander de Okeston, of Okeston (alias Oxton), Devon, the second husband of Joan de Vautort, widow of Ralph de Vautort, Sir Roger's elder brother. Joan de Vautort was the mistress of Richard, 1st Earl of Cornwall (1209–1272), second son of King John. By Okeston she had a son Sir James Okeston, who before he died childless named as his heir the son of his half-sister Joan, daughter of Earl Richard and wife of Richard Champernowne of Clyst Champernowne, near Exeter, Devon. The Champernown family was thenceforth seated at Modbury. Sir James Okeston (son of Sir Alexander de Okeston) granted Bridford to Richard Champernowne, as evidenced in a deed dated 1314